Never mind. commit eeb03a6eaa02e9171f91e385c52a69b159fc6117 is the patch
referenced in https://lists.ozlabs.org/pipermail/linuxppc-
dev/2014-July/119179.html
** Changed in: linux (Ubuntu Utopic)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1352990
Title:
remap_4K_pfn() safety improvement needed for Ubuntu 14.10
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Utopic:
Fix Released
Bug description:
== Comment: #0 - Brian Hart <[email protected]> - 2014-08-04 17:41:57 ==
---Problem Description---
The current implementation of remap_4k_pfn() trusts that it's safe to map the
PFN supplied by the requestor. But there may be PFNs that are not safe to map
via remap_4k_pfn(). (For example, the addresses at which PCI MMIO regions are
mapped in some hypervisor configurations.) When an unsafe PFN passes through
remap_4k_pfn() some address bits may be unknowingly dropped by the underlying
remapping routines. When that happens the remap will appear to succeed, but
any later attempt to use the mapping will checkstop the machine because the
truncated target address is not present in the machine.
A patch has been submitted that will cause remap_4k_pfn() to detect
and reject these unsafe requests:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2014-July/119179.html
Our project needs some form of this safety improvement in the Ubuntu 14.10
release.
---uname output---
Linux tul115p1 3.16.0-6-generic #11-Ubuntu SMP Mon Jul 28 02:00:45 UTC 2014
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = 8286-42A
---Debugger---
A debugger is not configured
---Steps to Reproduce---
The problem requires a hypervisor that allows PCI MMIO regions to span above
the 46-bit line, and a device driver that maps MMIO regions using
remap_4k_pfn().
I can provide detailed instructions and a driver upon request.
Stack trace output:
no
Oops output:
no
System Dump Info:
The system is not configured to capture a system dump.
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